ESCA or xps might be the simplest depending on what concentration you
have. You might be limited to about 1 to 2 atomic percent for those
elements using the above.
I would do Atomic Absorption spectroscopy.
If you need any help Im a chemist and have done quite a few analyses
I'm not familiar with the analysis methods for Ti, but somewhere they
are using Leco combustion. C, O, N and H are typically at 80-2000 ppm.
Are you used to analyse such concentration of these elements by ESCA
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